Here are a few possible reasons for this:

1. You may have created more than one account with similar names and the same email address. If you are sure you have created an account in the past, but have forgotten your account login name or password, please do not create a new account. Instead, use the Login screen to have your existing account information sent to you via email.
2. Your account may be deleted if you have violated one or more of the discussion forum rules.
3. If you created or changed your account profile more than a two weeks ago, but never confirmed your account, your account may be deleted. Periodically, the administrator will delete any accounts that have been pending confirmation for more than two weeks.